linux-kernel - Re: [PATCH v4 09/10] iio: adc: ad4080: add driver support

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Message-ID: <20250504164015.4b6f8dd1@jic23-huawei>
Date: Sun, 4 May 2025 16:40:15 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Antoniu Miclaus <antoniu.miclaus@...log.com>
Cc: <robh@...nel.org>, <conor+dt@...nel.org>, <linux-iio@...r.kernel.org>,
 <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 09/10] iio: adc: ad4080: add driver support

On Fri, 2 May 2025 11:59:04 +0300
Antoniu Miclaus <antoniu.miclaus@...log.com> wrote:

> Add support for AD4080 high-speed, low noise, low distortion,
> 20-bit, Easy Drive, successive approximation register (SAR)
> analog-to-digital converter (ADC).
> 
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>

One trivial thing I noticed to add to Nuno's much more detailed review!


> diff --git a/drivers/iio/adc/ad4080.c b/drivers/iio/adc/ad4080.c
> new file mode 100644
> index 000000000000..9168dee9323e
> --- /dev/null
> +++ b/drivers/iio/adc/ad4080.c

> +static int ad4080_set_dec_rate(struct iio_dev *dev,
> +			       const struct iio_chan_spec *chan,
> +			       unsigned int mode)
> +{
> +	struct ad4080_state *st = iio_priv(dev);
> +	int ret;
> +
> +	if ((st->filter_type >= SINC_5 && mode >= 512) || mode < 2)
> +		return -EINVAL;
> +
> +	ret = regmap_update_bits(st->regmap, AD4080_REG_FILTER_CONFIG,
> +				 AD4080_FILTER_CONFIG_SINC_DEC_RATE_MSK,
> +				 FIELD_PREP(AD4080_FILTER_CONFIG_SINC_DEC_RATE_MSK,
> +					    (ilog2(mode) - 1)));
> +	if (ret)
> +		return ret;
> +
> +	return 0;

return regmap_update_bits();


> +}